Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d5ad04905b6eff…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 19:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78a3a94605241067695c8eed87c8f50a SHA-1: d1da63a65ae7d670f736b898e82b3ab6a35c0e6d SHA-256: f4d5ad04905b6effeeb8009746d16dd77c986f24ef94ef576b53173ba344488c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for malicious purposes. The presence of numerous PDF links and the use of compromised CMS upload storage further support its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fab5f1a5626---51361458383.pdf In PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/083d2e96a805321ccdd566c205997d7b/43905159594.pdfIn PDF document text
    • http://jarosi.hu/files/file/27897553447.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb244d506---sazerojifav.pdfIn PDF document text
    • http://infunplastic.com/d/files/52953927331.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37d853241---topifamigoxuralilarexaw.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/koxukinaxopefibabivabawal.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c707f0caa---jelal.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/22240957512.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ba525f66b54fe13d844ff76f0a1d6f21/60066323257.pdfIn PDF document text
    • https://tepihtrava.rs//files/fovefuvimebezimonodobi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jci6j764tndr0g4gbnl4eap6c2/jenuguxoxexanotefu.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/pezij.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d46de31703a---pinapananekufodimuve.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/95948822877.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/40075730582.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kfa7742qlo08i6lrgtncmc5877/7353282430.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/riwuwurijuwin.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3b2265a784c5f4221896d26b1f09dc1f/moles.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/vivemazagibemoran.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9ef61c48---dalazuwo.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a497cf78fd2---48062734469.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/33e8e46b101220fba6f838d826fbec30/50721242566.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/sazobefifemoguromamo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160be27f4a4497---megukenigotun.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/15201786898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+deep+clean+your+house+checklistPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 10996 bytes
SHA-256: 411d1fb4bfc33f5f0ae7a73d4e0df01822a4f154374fceddb653e7ef3cb2518c
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17520 bytes
SHA-256: 8d539d14b0fbd173e6eb8741c3ea955d402ff9f5315545092dc85680997dc331
font_02_sfnt_off00013c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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